libavcodec/nuv.c

   1 /*
   2  * NuppelVideo decoder
   3  * Copyright (c) 2006 Reimar Doeffinger
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * FFmpeg is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with FFmpeg; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23
  24 #include "common.h"
  25 #include "avcodec.h"
  26
  27 #include "bswap.h"
  28 #include "dsputil.h"
  29 #include "lzo.h"
  30 #include "rtjpeg.h"
  31
  32 typedef struct {
  33     AVFrame pic;
  34     int width, height;
  35     unsigned int decomp_size;
  36     unsigned char* decomp_buf;
  37     uint32_t lq[64], cq[64];
  38     RTJpegContext rtj;
  39     DSPContext dsp;
  40 } NuvContext;
  41
  42 /**
  43  * \brief copy frame data from buffer to AVFrame, handling stride.
  44  * \param f destination AVFrame
  45  * \param src source buffer, does not use any line-stride
  46  * \param width width of the video frame
  47  * \param height height of the video frame
  48  */
  49 static void copy_frame(AVFrame *f, uint8_t *src,
  50                        int width, int height) {
  51     AVPicture pic;
  52     avpicture_fill(&pic, src, PIX_FMT_YUV420P, width, height);
  53     av_picture_copy((AVPicture *)f, &pic, PIX_FMT_YUV420P, width, height);
  54 }
  55
  56 /**
  57  * \brief extract quantization tables from codec data into our context
  58  */
  59 static int get_quant(AVCodecContext *avctx, NuvContext *c,
  60                      uint8_t *buf, int size) {
  61     int i;
  62     if (size < 2 * 64 * 4) {
  63         av_log(avctx, AV_LOG_ERROR, "insufficient rtjpeg quant data\n");
  64         return -1;
  65     }
  66     for (i = 0; i < 64; i++, buf += 4)
  67         c->lq[i] = AV_RL32(buf);
  68     for (i = 0; i < 64; i++, buf += 4)
  69         c->cq[i] = AV_RL32(buf);
  70     return 0;
  71 }
  72
  73 static int decode_frame(AVCodecContext *avctx, void *data, int *data_size,
  74                         uint8_t *buf, int buf_size) {
  75     NuvContext *c = (NuvContext *)avctx->priv_data;
  76     AVFrame *picture = data;
  77     int orig_size = buf_size;
  78     enum {NUV_UNCOMPRESSED = '0', NUV_RTJPEG = '1',
  79           NUV_RTJPEG_IN_LZO = '2', NUV_LZO = '3',
  80           NUV_BLACK = 'N', NUV_COPY_LAST = 'L'} comptype;
  81
  82     if (buf_size < 12) {
  83         av_log(avctx, AV_LOG_ERROR, "coded frame too small\n");
  84         return -1;
  85     }
  86
  87     if (c->pic.data[0])
  88         avctx->release_buffer(avctx, &c->pic);
  89     c->pic.reference = 1;
  90     c->pic.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_READABLE |
  91                           FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
  92     if (avctx->get_buffer(avctx, &c->pic) < 0) {
  93         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
  94         return -1;
  95     }
  96
  97     // codec data (rtjpeg quant tables)
  98     if (buf[0] == 'D' && buf[1] == 'R') {
  99         int ret;
 100         // skip rest of the frameheader.
 101         buf = &buf[12];
 102         buf_size -= 12;
 103         ret = get_quant(avctx, c, buf, buf_size);
 104         if (ret < 0)
 105             return ret;
 106         rtjpeg_decode_init(&c->rtj, &c->dsp, c->width, c->height, c->lq, c->cq);
 107         return orig_size;
 108     }
 109
 110     if (buf[0] != 'V' || buf_size < 12) {
 111         av_log(avctx, AV_LOG_ERROR, "not a nuv video frame\n");
 112         return -1;
 113     }
 114     comptype = buf[1];
 115     // skip rest of the frameheader.
 116     buf = &buf[12];
 117     buf_size -= 12;
 118
 119     c->pic.pict_type = FF_I_TYPE;
 120     c->pic.key_frame = 1;
 121     // decompress/copy/whatever data
 122     switch (comptype) {
 123         case NUV_UNCOMPRESSED: {
 124             int height = c->height;
 125             if (buf_size < c->width * height * 3 / 2) {
 126                 av_log(avctx, AV_LOG_ERROR, "uncompressed frame too short\n");
 127                 height = buf_size / c->width / 3 * 2;
 128             }
 129             copy_frame(&c->pic, buf, c->width, height);
 130             break;
 131         }
 132         case NUV_RTJPEG: {
 133             rtjpeg_decode_frame_yuv420(&c->rtj, &c->pic, buf, buf_size);
 134             break;
 135         }
 136         case NUV_RTJPEG_IN_LZO: {
 137             int outlen = c->decomp_size, inlen = buf_size;
 138             if (lzo1x_decode(c->decomp_buf, &outlen, buf, &inlen))
 139                 av_log(avctx, AV_LOG_ERROR, "error during lzo decompression\n");
 140             rtjpeg_decode_frame_yuv420(&c->rtj, &c->pic, c->decomp_buf, c->decomp_size);
 141             break;
 142         }
 143         case NUV_LZO: {
 144             int outlen = c->decomp_size, inlen = buf_size;
 145             if (lzo1x_decode(c->decomp_buf, &outlen, buf, &inlen))
 146                 av_log(avctx, AV_LOG_ERROR, "error during lzo decompression\n");
 147             copy_frame(&c->pic, c->decomp_buf, c->width, c->height);
 148             break;
 149         }
 150         case NUV_BLACK: {
 151             memset(c->pic.data[0], 0, c->width * c->height);
 152             memset(c->pic.data[1], 128, c->width * c->height / 4);
 153             memset(c->pic.data[2], 128, c->width * c->height / 4);
 154             break;
 155         }
 156         case NUV_COPY_LAST: {
 157             c->pic.pict_type = FF_P_TYPE;
 158             c->pic.key_frame = 0;
 159             /* nothing more to do here */
 160             break;
 161         }
 162         default:
 163             av_log(avctx, AV_LOG_ERROR, "unknown compression\n");
 164             return -1;
 165     }
 166
 167     *picture = c->pic;
 168     *data_size = sizeof(AVFrame);
 169     return orig_size;
 170 }
 171
 172 static int decode_init(AVCodecContext *avctx) {
 173     NuvContext *c = (NuvContext *)avctx->priv_data;
 174     avctx->width = (avctx->width + 1) & ~1;
 175     avctx->height = (avctx->height + 1) & ~1;
 176     if (avcodec_check_dimensions(avctx, avctx->height, avctx->width) < 0) {
 177         return 1;
 178     }
 179     avctx->has_b_frames = 0;
 180     avctx->pix_fmt = PIX_FMT_YUV420P;
 181     c->pic.data[0] = NULL;
 182     c->width = avctx->width;
 183     c->height = avctx->height;
 184     c->decomp_size = c->height * c->width * 3 / 2;
 185     c->decomp_buf = av_malloc(c->decomp_size + LZO_OUTPUT_PADDING);
 186     if (!c->decomp_buf) {
 187         av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
 188         return 1;
 189     }
 190     dsputil_init(&c->dsp, avctx);
 191     if (avctx->extradata_size)
 192         get_quant(avctx, c, avctx->extradata, avctx->extradata_size);
 193     rtjpeg_decode_init(&c->rtj, &c->dsp, c->width, c->height, c->lq, c->cq);
 194     return 0;
 195 }
 196
 197 static int decode_end(AVCodecContext *avctx) {
 198     NuvContext *c = (NuvContext *)avctx->priv_data;
 199     av_freep(&c->decomp_buf);
 200     if (c->pic.data[0])
 201         avctx->release_buffer(avctx, &c->pic);
 202     return 0;
 203 }
 204
 205 AVCodec nuv_decoder = {
 206     "nuv",
 207     CODEC_TYPE_VIDEO,
 208     CODEC_ID_NUV,
 209     sizeof(NuvContext),
 210     decode_init,
 211     NULL,
 212     decode_end,
 213     decode_frame,
 214     CODEC_CAP_DR1,
 215 };
 216